Two-piece plowshare



Dec. 18, 1962 E. SCREMIN 3,

TWO-PIECE PLOWSHARE Filed Nov. 8, 1960 E rnesf .Screm/n INVENTOR.

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United States Patent ()fiice 3,068,945 Patented Dec. 18, 1962 Filed Nov. 8, 1960, Ser. No. 63,055 Claims. (Cl. 172-749) This invention relates to an improved two-piece plowshare to take the place of the usual or conventional-type one-piece plowshare.

Persons conversant with the art of plowshares are aware that it is almost invariably true that the point of a plowshare is subjected to severe wear and tear. It may wear out and be damaged gradually; or, may crack and snap off in little or no time and when these situations develop, the farmer does that which is necessary, that is, has to throw away the entire unit replace it with a new plowshare. Manifestly, this constitutes a situation which is not only perplexing; it involves an expenditure of valuable time, labor and exasperating expense.

In order to successfully cope with the above briefly stated problem, it is the objective in the instant matter to provide the blade part, which may be only partly worn, with a readily attachable, detachable easy-to-replace point. To this end, an adapter bracket is welded or otherwise properly mounted on the plowshare support fixture or socalled frog. This bracket embodies an extending key and the key is keyed in a keyway expressly provided therefor on the rear or back side of the renewable point. This simple and practical advance, as experimental use has repeatedly shown, has proved out to be a feasible and meritorious solution of the plowshare repair and replacement problem.

Another object of this invention is to provide a simplified construction and combination of component parts and features in a novel plowshare which makes it practical to incorporate the same, not only in an all new moldboard and two-piece plowshare construction, but makes practical the idea of satisfactorily converting an old plow structure into one having the advantages and features which are now being ofiered to the manufacturer, retailer and users.

In carrying out a preferred embodiment of the invention the main body or blade of the plowshare is removably bolted on a backing member constituting a component part of the fixture or frog. One end of the blade adjacent the attachable and detachable point is mitered to provide an oblique angle and the end of the point adjacent thereto is correspondingly angled. An adapter bracket is fixed to the frog and has a projecting T-shaped rib which constitutes the aforementioned key. This key is slidingly wedged in a wedge-shaped keyway also T-shaped, said keyway formed in a lug provided atone corner portion of the point, the entrance end of the keyway being flush with the adjacent vertical edge of said point.

These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughout, and in which:

FIG. 1 is a view in perspective of the improved plowshare.

FIG. 2 is a section taken approximately on the line 22 of FIG. 1 but showing the details on the rearward side of the plowshare. I

FIG. 3 is a vertical section on the line 3-3 of FIG. 2; and

FIG. 4 is a fragmentary rear view showing not only the details of construction but how the quick separable connection between the point and blade is made.

In FIG. 1 the moldboard is denoted at 6 and the improved plowshare at 8. The plowshare comprises, as already suggested, an elongated part or body which is here specifically designated as the blade 10. This is of the usual cross-section and has its lower lengthwise edge sharpened at 12. The renewable and readily attachable and detachable improved point is denoted generally by the numeral 14 and it has a cutting edge 16 and a vertical abutting end or edge 18 to abut the oblique angled cooperating edge 2i) of the blade. The rearward or back side 22 of the point (FIG. 4) is provided in the lower left hand corner with an elongated boss or rib 24 which is more specifically designated as a lug and this lug is provided with the desired lengthwise keyway 2 6. The keyway is T-shaped in cross-section and also wedge-like to facilitate acceptance and reliable retention of the T-shaped rib or key 28 forming a part of the adapter bracket 30. The extended end portion is denoted at 32, that is the portion projecting beyond the edge or end 20. The shank portion 34 is fixedly mounted on the fixture or frog 36. This frog embodies a base 38 and struts 40 carrying the backing member or plate 42. It is on this plate 42 that the blade 10 is removably bolted, the bolts denoted at 44 and the nuts at 46.

As suggested this improved and unique adaptation provides a novel two-piece plowshare, the utility of which is enhanced as a result of this renewable point idea. Experience has shown that the point can be removed in a matter of seconds and replaced with a new one when, of course, the old one has become worn or broken and unsuitable for use.

The means for coupling the blade 10 and point 14 together could of course be reversed from the order shown for example in FIG. 4 and this aspect of the concept is to be taken into account in evaluating the improved construction. Manifestly this plowshare accomplishes all things any other plowshare might be required to do. But

in addition, the increased utility and the saving of time, material and expense renders the over-all adaptation suitable for the purposes intended.

The foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly all suitable modifications and equivalents may be resorted to, falling within the scope 1 of the invention as claimed.

What is claimed as new is as follows:

1. A plow comprising a frog, a share including a blade mounted on the frog and including a forward end, and a bracket mounted on the frog and including a generally T- shaped rib projecting forwardly from the frog and the blade, said share further including a replaceable point removably mounted on the bracket and including a rear end in abutting engagement with said forward blade end, said point further including a generally T-shaped way longitudinally slidably receiving the rib for mounting said point on the bracket in alignment with the blade.

2. A plow comprising a frog, a share including a blade mounted on the frog and including a forward end, and a bracket mounted on the frog and including a generally T-shaped rib projecting forwardly from the frog and the blade, said share further including a replaceable point removably mounted on the bracket and including a rear end in abutting engagement with said forward blade end, said point further including a generally T-shaped way longitudinally slidably receiving the rib for mounting said point on the bracket in alignment with the blade, said way and said rib being longitudinally tapered to provide a wedging fit for the rib for frictionally retaining the point on the bracket.

3. A plow comprising a frog, a share including a blade mounted on the frog, and a rib mounted on the frog behind the blade and projecting forwardly from said frog, said share further including a replaceable point comprising on its rear side a longitudinal way being longitudinally tapered and said rib being longitudinally tapered for wedging engagement in the Way for frictionally retaining the point.

4. A plow comprising a frog, a share including a blade mounted on the frog, and a rib mounted on the frog behind the blade and projecting forwardly from said said frog, said share further including a replaceable point comprising on its rear side a longitudinal way being longitudinally tapered and said rib being longitudinally tapered for wedging engagement in the way for frictionally retaining the point, said way and said rib further being generally T-shaped in cross-section.

5. A plow comprising a frog, a moldboard mounted on said frog, a share including a blade secured on the frog, a bracket mounted horizontally on the frog behind the blade, said share further including a replaceable point in end-abutting engagement with the blade, said point comprising a rear side including a longitudinally tapered, generally T-shaped way, said bracket comprising a forwardly projecting, longitudinally tapered generally T-shaped rib wedgingly engaged in the way for frictionally securing the point on the bracket.

References Cited in the file of this patent UNITED STATES PATENTS 974,675 Kelly Nov. 1, 1910 2,222,071 Gustafson Nov. 19, 1940 2,424,136 Baker July 15, 1947 2,699,104 Jaeger Jan. 11, 1955 2,724,317 Zwaska Nov. 22, 1955 FOREIGN PATENTS 921 Great Britain Nov.'23, 1888 of 1888 355,433 Great Britain Aug. 27, 1931 

